By M. Schutze
This ebook comprises papers provided at a workshop held in Frankfurt am major, Germany in February 2001. The sections comprise papers on: alumina formers; iron oxide and chromia formers; composites and coatings; thermal barrier platforms; and basic lifetime prediction techniques
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Additional info for B0772 Lifetime modelling of high temperature corrosion processes
38mm-thick sample of Kanthal APM (Fe-23Cr-6AI mass%). The test conditions examined involved a period of isothermal oxidation at temperatures of 1000, 1100or 1200°Cfollowed by cooling at a constant rate of 104°C/h. Separate runs were performed to evaluate the influence of cooling rate from 1100°C. A consistent observation was that the propagation kinetics of the wedge crack were strongly influenced by creep relaxation processes within the alloy. These were manifested by periods of zero crack growth during the early stages of cooling as the rate of increase of stress in the vicinity of the crack tip was reduced by stress relaxation.
3mass alloys and also of the thicker Aluchrom YHf sections, as witnessed by the continuity of the tB/o versus thickness relationship at 1200°C and 1300°C over the entire thickness range. A second failure mode, Mechanically Induced Chemical Failure (MICF), occurred under those circumstances where mechanical processes caused scale failure on cooling. It resulted in lower times to breakaway both indirectly, through scale spallation enhancing the rate of aluminium consumption and directly, by initiating chemical failure at cracks through the scale, which were unable to reheal on further exposure.
J. P. Wilber, J. R. Nicholls and M. J. Bennett in Microscopy of Oxidation-3 (5. B. Newcomb and J. A. Little, eds). 207-220. 9. H. AI-Badairy, G. J. Tatlock and M. J. Bennett, Mater. , 2000, 17 101-107. 10. H. , EFC Publication No. 34. 50-65. 11. H. E. Evans, A. T. Donaldson and T. C. , 1999, 52, 379-402. 3 Prediction of Oxide Spallation from an Alumina-Forming Ferritic Steel H. E. EVANS and J. R. 38 mm-thick sample of Kanthal APM (Fe-23Cr-6Al mass'zs). The test conditions examined involved a period of isothermal oxidation at temperatures of 1000, 1100or 1200°Cfollowed by cooling at a constant rate of 104°C/h.
B0772 Lifetime modelling of high temperature corrosion processes by M. Schutze